what is you specs also plugins that your using. Is the rom good(verifed by goodrom or what ever the 64 verison is called)
laptop computer
i5 460@2.5
4gb ram
switch graphic intel hd\amd 5650 hd
windows 7
desktop computer
i3@2.9
6gb of ram
nvidia gtx 560ti
windows 7 64 home premium
switch to the Dx6 plugin.